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Preparation method of polymer nanocomposite with shape memory

A nanocomposite material and composite material technology are applied in the field of preparation of polymer nanocomposite materials, which can solve the problems of difficulty in preparing shape memory composite materials, poor compatibility, etc., and achieve fast excitation response speed, good shape recovery rate, Simple preparation method

Inactive Publication Date: 2015-05-13
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the current polymer shape memory composites prepared by melt blending have poor compatibility, and it is difficult to prepare shape memory composites with large size and repeated deformation.

Method used

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  • Preparation method of polymer nanocomposite with shape memory
  • Preparation method of polymer nanocomposite with shape memory
  • Preparation method of polymer nanocomposite with shape memory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing a polymer nanocomposite with shape memory, specifically comprising the steps of:

[0028] (1) First mix SEBS and extender oil evenly according to the mass ratio of 1:1, and leave it for 24 hours to obtain oil-extended SEBS.

[0029] (2) Weigh 37.2g oil-extended SEBS, 18.6g PCL, 3g SEBS-g-MA and 0.6g OMMT respectively, and mix well.

[0030] (3) Put the blended material in step (2) into the banbury chamber of the torque rheometer for melt blending. The blending conditions are set as: 195° C., 120 r / min rotating speed, and 15 min for time.

[0031] (4) The sample prepared in step (3) was hot-pressed in a hot press. The hot-pressing process conditions were 150 ° C, 5 MPa pre-pressed for 1 min, and then pressurized to 12 MPa for 5 min, and then cooled and held for 2 min. Shape memory nanocomposite samples with a thickness of 2 mm.

[0032] Die-cutting the obtained polymer shape memory nanocomposite into a long strip sample (denoted as l 0 ), and th...

Embodiment 2

[0037] Using the preparation method described in Example 1, weigh 37.8g oil-extended SEBS, 18.8g PCL, 3g SEBS-g-MA and 1.2g OMMT in step (2), and the prepared polymer nano Composite material as Example 2.

[0038] The primary shape recovery rate of Example 2 is 96.7%, and the secondary shape recovery rate is 95%, as shown in Table 1. The crystallization peak temperature of Example 2 is 29.54° C., and the crystallization peak temperature is 13.53 J / g. The tensile strength of embodiment 2 is 2.34MPa, and elongation at break is 261%, and its tensile stress curve is as figure 1 shown.

Embodiment 3

[0040] The operation steps are as follows:

[0041] Using the preparation method described in Example 1, weigh 36g of oil-extended SEBS, 18.0g of PCL, 3g of SEBS-g-MA and 3.0g of OMMT in step (2), and the prepared polymer nanometer with shape memory Composite material as Example 3.

[0042] The primary shape recovery rate of Example 3 is 88.9%, and the secondary shape recovery rate is 81.0%, as shown in Table 1. The crystallization peak temperature of Example 3 is 28.43° C., and the crystallization peak temperature is 14.40 J / g. The tensile strength of embodiment 3 is 3.0MPa, and elongation at break is 222%, and its tensile stress curve is as figure 1 shown.

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Abstract

The invention discloses a preparation method of a polymer nanocomposite with shape memory. According to the preparation method, a polystyrene-polyethylene / butane-polystyrene triblock copolymer SEBS is melt-blended with polycaprolactone PCL, and grafted maleic anhydride SEBS-g-MA and nano organic montmorillonite OMMT are added to modify a shape memory polymer composite so as to control the shape memory and deformation restoration capabilities of the polymer nanocomposite. The preparation method comprises the following steps: uniformly mixing the SEBS with extending oil at a mass ratio of 1:1 and placing for 24 h to obtain oil extended SEBS; blending the oil extended SEBS with the polycaprolactone PCL; adding the grafted maleic anhydride SEBS-g-MA and the nano organic montmorillonite OMMT and uniformly stirring to obtain a premixed sample; placing the premixed sample in a banburying chamber of a torque rheometer and carrying out melt-blending at 195 DEG C and 120 rpm for 15 min; and carrying out hot briquetting on the prepared sample in a hot press to obtain the polymer nanocomposite with shape memory. The preparation method provided by the invention is simple; the material has shape memory and favorable restoration rate and can be repeatedly used.

Description

technical field [0001] The invention relates to the technical field of polymer composite material preparation, in particular to a preparation method of a polymer nanocomposite material with shape memory. Background technique [0002] Shape memory materials are materials that can return to their original shape after undergoing a shape change under stimulus conditions. Compared with shape memory alloys, shape memory polymers have the characteristics of large recoverable deformation, low induction temperature, easy processing and molding, and wide application range. The preparation of shape memory polymer blend materials based on the method of melt blending has the advantages of simple preparation method, low cost, and easy regulation of properties. [0003] The biodegradable polymer material polyε‐caprolactone (PCL) has shape memory ability, it is easy to reach the deformation temperature during the experiment, the processing conditions are simple, and it has good elasticity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/02C08L67/04C08L51/00C08K9/04C08K3/34
Inventor 李晓燕王小娟王远雯史晨杰邹华姜发平陆臻王斯佳
Owner UNIV OF SHANGHAI FOR SCI & TECH
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